On Fri, 16 Sep 2016 11:25:54 +0200 Christoph Lauber <christ...@midsommar.ch> wrote:
> Hi H > > Are you sure you really need the "Offset" field for your aims? > Don't you need just the "Time frame size"? There you can choose "step > width" like minutes, days, month, years... > > The offset should be a feature, you can time which style to display > when. But I think this is not what you want to do. > > Regards > Christoph > Hi Christoph, Thanks for the response. I will take two steps back and explain what I am trying to accomplish rather than where I am having trouble. I have been a professional C/C++ developer, but have never used Python. (I could learn to write python scripts if required, but they are not obvious to me - yet) I have road crash data where, for each road crash, I have a field for date and a different field for time. (The data came as csv, I put it into postgis, but for Time Manager have saved it to a shp file) The data is updated every couple of months, and starts in 2001. When looking at road crash data I generally consider crashes in 5 year groupings. I am wanting to use Time Manager to show the 5 year groupings, annually. (There are times I may want to change the length of the groupings, so I want something where I can easily change from 5 years. I am currently dealing only with calender years) Using the 5 year groupings, this is I want from Time Manager: Frame 1 - road crashes 2001 to 2005 Frame 2 - road crashes 2002 to 2006 Frame 3 - road crashes 2003 to 2007 ... Frame 12 - road crashes 2012 to 2016 My understanding is that for this the Time Frame Size is 'one year' as that is the interval between each frame. (Correct me if I am wrong) I have seen a number of sample files, and my intent was to create 5 copies of the data, and offset them to cover a 5 year period in each (annual) frame. To make the situation more challenging, I am also thinking of doing a heatmap rather than just showing individual points. I do not think I can create a heatmap using multiple layers. My fall back solution is that I create a new table / layer that contains the primary key from my crashes table, the coordinates of the crash and a year in which to display it. Because each crash is being displayed in 5 different years, this table would have 5 entries for each crash, but Time Manager would step through a heatmap for each year. I was hoping I would not need to create a new table. Thanks again! H > > -----Ursprüngliche Nachricht----- > > Von: h [mailto:hdi...@bigpond.net.au] > > Gesendet: Dienstag, 13. September 2016 14:08 > > An: qgis-user <Qgis-user@lists.osgeo.org> > > Betreff: [Qgis-user] "Time Manager" - Offset units > > > > I have a couple of questions about the "Time Manager" plugin - > > firstly Is this the right place for me to post them to? > > This is the first of a couple of questions I have, so please > > redirect me to the correct place if this is not it. > > > > My first question is concerning the "Offset" field when adding > > layers. I have a dataset I want to step through in years showing > > data for current year and previous year. > > I can do this, by setting the offset for the 'previous' year as > > 32000000. I am guessing that the offset is in seconds (there are > > about 32 million seconds in a year) > > > > * Is my guess correct that the offset is in seconds? > > * Can I change the unit of the offset (I would like to use years)? > > * If the offset can only be entered in seconds, I will improve my > > approximation of 32 million seconds, but what do I do about leap > > years? > > > > Many thanks, > > H > > > > > _______________________________________________ Qgis-user mailing list Qgis-user@lists.osgeo.org List info: http://lists.osgeo.org/mailman/listinfo/qgis-user Unsubscribe: http://lists.osgeo.org/mailman/listinfo/qgis-user
